Heedlessness and neglect of divine signs

أَوَأَمِنَ أَهْلُ ٱلْقُرَىٰٓ أَن يَأْتِيَهُم بَأْسُنَا ضُحًى وَهُمْ يَلْعَبُونَ

Or did the people of the cities feel secure from Our punishment coming to them in the morning while they were at play?